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Calculate the electric field intensity at apoint 1m away from a charge of 1C in air.

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Given, q=1C, r =1m, k= `9 xx 10^(9)N-m^(2)//C^(2)` and E= ?
`therefore` Electric field intensity `E= k(q)/(r^(2))= 9 xx 10^(9)xx (1)/(1^(2))`
`rArr E=9 xx 10^(9)N//C`
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Knowledge Check

  • Electric field intensity at a point varies as r^(-3) for

    A
    a point charge
    B
    an electric dipole
    C
    a line charge of infinite length
    D
    a plane infinite sheet of charge

  • Electric field intensity at a point varies as r^(-3) for

    A
    a point charge
    B
    an electric dipole
    C
    a line charge of infinite length
    D
    a plane infinite sheet of charge

  • The electric field intensity at the surface of a charged conductor is

    A
    zero
    B
    directed normally to the surface
    C
    directed tangentially to the surface
    D
    directed at an angle to the surface

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